Miners buy a lot of cards, but we also push our cards 24/7.  Meaning any weak cards in our Rigs typically die within a few months.  Where if they were just used for gaming.  Some gamer who plays maybe 20 hours a week, will never push the cards to that level, and when they finally die, they will be past their warranty.  I seriously see them dropping the Warranty to 1 year.  IF I remember correctly, their dedicated Mining Cards only have a 3 month warranty.